Finding the Fourth Proportional to 69.81, 104.72 and 21.72

Step by Step Solution

1. Step 1: Write the proportion equation
   69.81 : 104.72 = 21.72 : x
2. Step 2: Convert to fraction form
   69.81/104.72 = 21.72/x
3. Step 3: Cross multiply
   69.81x = 104.72 × 21.72
4. Step 4: Simplify right side
   69.81x = 2,274.52
5. Step 5: Solve for x
   x = 2,274.52/69.81
6. Step 6: Final answer
   x = 32.58